Fix server shutdown in bin/tests/system/run.sh

a4f02819 is a flawed backport of
cf510593 - it retained the original
invocation of bin/tests/system/stop.pl in bin/tests/system/run.sh.  This
results in the former script being called twice for each system test,
which does not cause problems on Unix systems, but triggers false
positives about named instances dying prematurely on Windows.  Fix by
removing the offending invocation of bin/tests/system/stop.pl from
bin/tests/system/run.sh.
81 jobs for !3500 with michal/fix-server-shutdown-in-run.sh in 13 seconds (queued for 5 seconds)
detached
Status Job ID Name Coverage
  Precheck
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  Build
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  Unit
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  System
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  Docs
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  Postcheck
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